2. 外语
  3. The telephone had been ringing for several minutes before it______ (answer).

The telephone had been ringing for several minutes before it______ (answer).

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问题 The telephone had been ringing for several minutes before it______ (answer).
选项
答案was answered
解析 句意：电话在接之前响了好几分钟。这里虽然前面用的过去完成进行时．但电话被接这个动作是瞬间的，不能持续。所以只能用过去时。
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